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https://www.readbyqxmd.com/read/28538776/spontaneous-pneumomediastinum-experience-in-18-patients-during-the-last-12-years
#1
Patrícia Dionísio, Luís Martins, Susana Moreira, Alda Manique, Rita Macedo, Fátima Caeiro, Luísa Boal, Cristina Bárbara
Objective: To characterize clinically all of the patients with spontaneous pneumomediastinum (SPM) admitted to an adult pulmonology ward in Lisbon, Portugal. Methods: This was a retrospective descriptive study of all adult patients (≥ 18 years of age) diagnosed with SPM between January of 2004 and September of 2015. Results: At least one predisposing factor was identified in most (88.9%) of the 18 patients who presented with SPM during the study period...
March 2017: Jornal Brasileiro de Pneumologia: Publicaça̋o Oficial da Sociedade Brasileira de Pneumologia e Tisilogia
https://www.readbyqxmd.com/read/28535484/biomonitoring-of-genotoxicity-of-industrial-fertilizer-pollutants-in-aiolopus-thalassinus-orthoptera-acrididae-using-alkaline-comet-assay
#2
Eman A Abdelfattah, Maria Augustyniak, Hesham A Yousef
Phosphate fertilizer industry is considered as one of the main sources of environmental pollutants. Besides solid waste products, e.g. phosphates, sulphates, and heavy metals, also atmospheric pollutants, such as hydrofluoric acid fumes (HF), sulphur dioxide (SO2), nitrogen oxides (NO2), and particulate matter with diameter up to 10 μm (PM10) can be dangerous. Genotoxic effect of these pollutants was monitored by assessing the DNA damage using alkaline comet assay on cells from brain, thoracic muscles and gut of Aiolopus thalassinus collected at three sites (A-C) located at 1, 3, and 6 km away from Abu-Zaabal Company for Fertilizers and Chemical Industries...
May 16, 2017: Chemosphere
https://www.readbyqxmd.com/read/28531648/cationic-surfactant-blocks-radical-inhibiting-sites-on-silica
#3
Tan Zhang, Frank D Blum
Surfactant-catalyzed room-temperature radical polymerization of methyl methacrylate (MMA) was conducted in the presence of fumed silica nanoparticles and water. Three types of surfactants, cationic (CTAB), nonionic (Triton X-100) or anionic (SDS), were used to catalyze the decomposition of the initiator, 2,2'-azobisisobutyronitrile (AIBN). The surfactant-catalyzed decomposition rate constant for AIBN at room temperature was found to be independent of the surfactant type. However, the rates of polymerization of the MMA emulsion gels at room temperature were found to depend on the types of surfactant with: cationic>nonionic>anionic...
May 12, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28530570/enhanced-antimicrobial-activity-of-essential-oil-components-immobilized-on-silica-particles
#4
María Ruiz-Rico, Édgar Pérez-Esteve, Andrea Bernardos, Félix Sancenón, Ramón Martínez-Máñez, María D Marcos, José M Barat
The antimicrobial activity of essential oils components (EOCs) is well-known. However, their high volatility and powerful aroma limit their application in the formulation of a wide range of food products. In this context, the antimicrobial activity of carvacrol, eugenol, thymol and vanillin grafted onto the surface of three silica supports with different morphologies, textural properties and chemical reactivities (fumed silica, amorphous silica and MCM-41) was evaluated herein. Materials characterization revealed a good immobilization yield and all the devices showed a micro-scale particle size...
October 15, 2017: Food Chemistry
https://www.readbyqxmd.com/read/28520196/environmentally-friendly-recycling-of-fuel-cell-s-membrane-electrode-assembly-using-ionic-liquids
#5
Sophie Legeai, Maxime Balva, Nathalie Leclerc, Emmanuel Billy, Eric Meux
The platinum nanoparticles used as catalyst in Proton Exchange Membrane Fuel Cells (PEMFCs) could represent around 46 % of the total price of the cells1 for a large scale production which is one of the limitation of their commercialization. The recycling of this platinum catalyst can then be the best alternative to limit the production cost of PEMFCs. Usual recovery routes for spent catalysts containing platinum are pyro-hydrometallurgical processes in which a calcination step is followed by aqua regia treatment, generating fumes and NOx emission, respectively...
May 18, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28516412/optimization-of-adhesive-pastes-for-dental-caries-prevention
#6
Patteera Sodata, Apa Juntavee, Niwut Juntavee, Jomjai Peerapattana
Dental caries prevention products available on the market contain only remineralizing agents or antibacterial agents. This study aimed to develop adhesive pastes containing calcium phosphate and α-mangostin for dental caries prevention using the optimization technique. Calcium phosphate was used as a remineralizing agent, and extracted α-mangostin was used as an antibacterial agent. The effect of the independent variables, which were fumed silica, Eudragit(®) EPO, polyethylene glycol, and ethyl alcohol, on the responses was investigated...
May 17, 2017: AAPS PharmSciTech
https://www.readbyqxmd.com/read/28515054/longitudinal-decline-in-lung-function-among-older-construction-workers
#7
John M Dement, Laura S Welch, Knut Ringen, Kim Cranford, Patricia Quinn
BACKGROUND: Occupational exposures to vapours, gasses, dusts and fumes (VGDF) and chest X-ray abnormalities by the International Labour Office (ILO) classification system are associated with reduced lung function, with the majority of published studies being cross-sectional. We examined the effects of VGDF exposures, as well as ILO parenchymal changes, pleural plaque and diffuse pleural thickening (DPT) on reduction in lung function in a longitudinal study. METHODS: Chest radiographs and spirometry for 3150 ageing construction workers enrolled in a medical screening programme with a baseline and at least one follow-up examination were studied...
May 17, 2017: Occupational and Environmental Medicine
https://www.readbyqxmd.com/read/28503304/clinico-pathologic-presentation-of-hypersensitivity-pneumonitis-in-egyptian-patients-a-multidisciplinary-study
#8
Dalia Abd El-Kareem, Yosri M Akl, Gina A Nakhla, Ali A Elhindawi, Mahmoud A Eltorky
BACKGROUND: Hypersensitivity pneumonitis (HP) is a common diffuse parenchymal lung disease in Egypt which can be difficult to recognize due to the dynamic symptoms & associated environmental factors. METHODS: Forty-three Egyptian patients were enrolled in this study, presenting with dyspnea and cough, predominant ground-glass opacity (GGO) in high-resolution computed tomography (HRCT) where lung biopsy was needed to establish the diagnosis. RESULTS: The age range was 15 to 60 years...
2017: Multidisciplinary Respiratory Medicine
https://www.readbyqxmd.com/read/28501768/association-between-chinese-cooking-oil-fumes-and-sleep-quality-among-a-middle-aged-chinese-population
#9
Fu Wei, Guanghui Nie, Bo Zhou, Liang Wang, Yifei Ma, Suwan Peng, Songfeng Ou, Jian Qin, Li'e Zhang, Shu Li, Ruosi Zou, Xiaoyun Zeng, Zhiyong Zhang, Yunfeng Zou
Poor sleep quality is an important symptom of many medical or psychiatric disorders. However, the impact of cooking oil fumes (COFs) on sleep quality has not been studied. This population-based cross-sectional study was conducted to examine the association between COFs of Chinese household cooking and sleep quality. Individual sleep quality assessment was completed in 2197 participants with an average age of 37.52 years, through Pittsburgh Sleep Quality Index (PSQI). Information about their cooking practice were also collected by self-reported questionnaire...
May 11, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28490043/chemical-and-physical-exposures-in-the-emerging-us-green-collar-workforce
#10
Charles J Chen, Kevin J Moore, Cristina A Fernandez, Kristopher L Arheart, William G LeBlanc, Manuel Cifuentes, Laura A McClure, Sharon L Christ, Lora E Fleming, David J Lee, Alberto J Caban-Martinez
OBJECTIVE: "Green collar" workers serve in occupations that directly improve environmental quality and sustainability. This study estimates and compares the prevalence of select physical and chemical exposures among green versus non-green U.S. workers. METHODS: Data from the U.S. 2010 National Health Interview Survey (NHIS) Occupational Health Supplement were linked to the Occupational Information Network (ONET) Database. We examined four main exposures: 1) vapors, gas, dust, fumes (VGDF); 2) secondhand tobacco smoke; 3) skin hazards; 4) outdoor work...
May 2017: Journal of Occupational and Environmental Medicine
https://www.readbyqxmd.com/read/28483188/agnihotra-yajna-a-prototype-of-south-asian-traditional-medical-knowledge
#11
Rahul Raveendran Nair
This study conceptualizes the principle of agnihotra yajna. The perusal of ancient and modern literature reveals that the functioning of the human body is impossible without maintaining an energetic continuum driven by sunlight. The seven major chakras existing over the spinal cord help to maintain this energetic continuum. Agnihotra yajna is proposed to balance the chakra system as a whole by minimizing entropy. Offerings of natural elements to fire lit in a copper pyramid during agnihotra liberate various volatile compounds having potent pharmacological actions...
April 2017: Journal of Acupuncture and Meridian Studies
https://www.readbyqxmd.com/read/28480337/structure-activity-relationships-of-engineered-nanomaterials-in-inducing-nlrp3-inflammasome-activation-and-chronic-lung-fibrosis
#12
Xiang Wang, Bingbing Sun, Sijin Liu, Tian Xia
It has been demonstrated that certain engineered nanomaterials (ENMs) could induce chronic lung inflammation and fibrosis, however, the key structure activity relationships (SARs) that the link the physicochemical properties and the fibrogenic effects have not been thoroughly reviewed. Recently, significant progress has been made in our understanding of the SAR, and it has been demonstrated that ENMs including rare earth oxides (REOs), graphene and graphene oxides (GO), fumed silica, as well as high aspect ratio materials (such as CNTs and CeO2 nanowires etc...
April 2017: NanoImpact
https://www.readbyqxmd.com/read/28480299/the-2-8%C3%A2-%C3%A3-electron-microscopy-structure-of-adeno-associated-virus-dj-bound-by-a-heparinoid-pentasaccharide
#13
Qing Xie, John M Spear, Alex J Noble, Duncan R Sousa, Nancy L Meyer, Omar Davulcu, Fuming Zhang, Robert J Linhardt, Scott M Stagg, Michael S Chapman
Atomic structures of adeno-associated virus (AAV)-DJ, alone and in complex with fondaparinux, have been determined by cryoelectron microscopy at 3 Å resolution. The gene therapy vector, AAV-DJ, is a hybrid of natural serotypes that was previously derived by directed evolution, selecting for hepatocyte entry and resistance to neutralization by human serum. The structure of AAV-DJ differs from that of parental serotypes in two regions where neutralizing antibodies bind, so immune escape appears to have been the primary driver of AAV-DJ's directed evolution...
June 16, 2017: Molecular Therapy. Methods & Clinical Development
https://www.readbyqxmd.com/read/28476080/investigating-the-heavy-metal-adsorption-of-mesoporous-silica-materials-prepared-by-microwave-synthesis
#14
Wenjie Zhu, Jingxuan Wang, Di Wu, Xitong Li, Yongming Luo, Caiyun Han, Wenhui Ma, Sufang He
Mesoporous silica materials (MSMs) of the MCM-41 type were rapidly synthesized by microwave heating using silica fume as silica source and evaluated as adsorbents for the removal of Cu(2+), Pb(2+), and Cd(2+) from aqueous solutions. The effects of microwave heating times on the pore structure of the resulting MSMs were investigated as well as the effects of different acids which were employed to adjust the solution pH during the synthesis. The obtained MCM-41 samples were characterized by nitrogen adsorption-desorption analyses, X-ray powder diffraction, and transmission electron microscopy...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28472553/sustainable-gel-electrolyte-containing-pyrazole-as-corrosion-inhibitor-and-dendrite-suppressor-for-aqueous-zn-limn2o4-battery
#15
Tuan Hoang, The Nam Long Doan, Julie Hyeonjoo Cho, Jane Ying Jun Su, Christine Lee, Changyu Lu, Pu Chen
The Zn anode in secondary aqueous batteries suffers from dendrite formation and corrosion. In this work, the dendrite is suppressed by using a simple but novel gel electrolyte containing fumed silica and an additive. The dendrite suppression is evidenced by chronoamprometry and ex-situ scanning electron microscopy examinations. Pyrazole as the additive in the electrolyte has been implemented. It is found that the presence of 0.2 wt% of pyrazole in the electrolyte helps minimize both corrosion and dendrite formation...
May 4, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28471503/the-use-of-directional-reflectance-measurement-for-in-vivo-assessment-of-protective-properties-of-cosmetics-in-the-infrared-radiation-range
#16
Sławomir Wilczyński, Anna Deda, Robert Koprowski, Anna Banyś, Barbara Błońska-Fajfrowska
Photoprotection of skin is now focused on UV radiation. The aim of this study was to evaluate in vivo cosmetic products in terms of protection against infrared radiation (IR) and propose a methodology for conducting such measurements. The directional reflectance (DR) of 12 UV filters, 6 care creams and 2 preparations containing fumed silica applied on the forearm of 36 volunteers was examined in six spectral bands for two angles of incidence. SOC-410 Directional Hemispherical Reflectometer was used to measure DR...
May 4, 2017: Photochemistry and Photobiology
https://www.readbyqxmd.com/read/28454390/expression-of-novel-cancer-testis-antigen-tmem31-increases-during-metastatic-melanoma-progression
#17
Jiaqiang Li, Xiaowen Zou, Cailing Li, Jianhua Zhong, Yan Chen, Xiaoyue Zhang, Fuming Qi, Mengshuo Li, Zhiming Cai, Aifa Tang
Cancer/testis (CT) antigens are promising targets for immunotherapy due to their restricted expression in the germ cells of the testis in healthy tissue and high immunogenicity. The aim of the present study was to determine whether transmembrane protein 31 (TMEM31) is a CT antigen and to investigate the pattern of TMEM31 expression during the progression of melanoma. The pattern of expression of human TMEM31 mRNA in multiple human tissues was determined through reverse transcription-polymerase chain reaction analysis...
April 2017: Oncology Letters
https://www.readbyqxmd.com/read/28452465/highly-efficient-fumed-silica-nanoparticles-for-peptide-bond-formation-converting-alanine-to-alanine-anhydride
#18
Chengchen Guo, Jacob S Jordan, Jeffery L Yarger, Gregory P Holland
In this work, thermal condensation of alanine adsorbed on fumed silica nanoparticles is investigated using thermal analysis and multiple spectroscopic techniques, including infrared (IR), Raman, and nuclear magnetic resonance (NMR) spectroscopies. Thermal analysis shows that adsorbed alanine can undergo thermal condensation, forming peptide bonds within a short time period and at a lower temperature (∼170 °C) on fumed silica nanoparticle surfaces than that in bulk (∼210 °C). Spectroscopic results further show that alanine is converted to alanine anhydride with a yield of 98...
May 9, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28446021/evaporation-of-drops-containing-silica-nanoparticles-of-varying-hydrophobicities-exploiting-particle-particle-interactions-for-additive-free-tunable-deposit-morphology
#19
Manos Anyfantakis, Damien Baigl, Bernard P Binks
We describe the systematic and quantitative investigation of a large number of patterns that emerge after the evaporation of aqueous drops containing fumed silica nanoparticles (NPs) of varying wettabilities for an extended particle concentration range. We show that for a chosen system, the dry pattern morphology is mainly determined by particle-particle interactions (Coulomb repulsion and hydrophobic attraction) in the bulk. These depend on both particle hydrophobicity and particle concentration within the drop...
May 8, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28445998/infrared-raman-and-magnetic-resonance-spectroscopic-study-of-sio2-c-nanopowders
#20
Dariya Savchenko, Vladimir Vorliček, Ekaterina Kalabukhova, Aleksandr Sitnikov, Andrii Vasin, Dmytro Kysil, Stanislav Sevostianov, Valentyn Tertykh, Alexei Nazarov
Optical and magnetic properties of SiO2:C nanopowders obtained by chemical and thermal modification of fumed silica were studied by Fourier transform infrared spectroscopy, Raman, continuous wave (CW) electron paramagnetic resonance (EPR), echo-detected EPR and pulsed electron nuclear double resonance (ENDOR) spectroscopy. Two overlapping signals of Lorentzian lineshape were detected in CW EPR spectra of the initial SiO2:C. The EPR signal at g = 2.0055(3) is due to the silicon dangling bonds, which vanishes after thermal annealing, and the second EPR signal at g = 2...
December 2017: Nanoscale Research Letters
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